Questions tagged [electron]
Anything related to the behavior and properties of electrons, i.e. the elementary subatomic particles accounting for electrical conduction in most solid materials, especially metals.
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In what pattern does the electrons get emitted from cathode in thermionic emission?
We have structure with an cathode and filament at the center. A cylindrical shaped anode with cavities surrounds the cathode (fig 1). When the cathode get heated the electrons are emitted from cathode ...
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2answers
119 views
Calculation for the distance between maximum swings in the drift distance of electrons
I am currently studying the textbook Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk. In section 2.4.1 Applying a Voltage, the authors have written the following:
In the ...
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1answer
42 views
Voltage drop in a conductor
My textbook, Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk, says the following in section 2.3.1 The Mechanisms of Voltage:
In regard to potential energies of free ...
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6answers
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How can electricity be positive when electrons are negative?
I don't understand how can a for example a battery be positive charged when the electrons are negative charged? I've read that protons are positive but they can't move so are all electricity negative?
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7answers
411 views
How many Electrons make a bit? [closed]
A bit, correct me if i'm wrong, is a digital signal which can be 0 or 1. To determine its value, a processor awaits an X amount of time. My question is: is there any way to determine how many ...
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0answers
50 views
How does the hot point-probe test affect p-type semiconductors?
In an n-type semiconductor if you place a hot probe close to a cold metal probe, the average thermal velocity of electrons near the hot probe increases which leads to a net electron motion from the ...
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3answers
52 views
Ground attached to negative terminal - where do the electrons come from?
My question pertains to this circuit:
Not considering conventional current direction, but rather considering actual electron flow: if the negative terminal is connected to the ground, where do the ...
1
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1answer
34 views
Thermal generation of electron-hole couples and reverse biasing
I'm studying the PN junction and I have some problems figuring out thermal generation of couples electron-hole in reverse biasing.
The analysis is the standard one (for example, one can find it in the ...
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2answers
222 views
What happens when switch is open [duplicate]
In a simple circuit, composed only of a lamp, a generator and a switch that connects the generator to the lamp.
What happens with electric current when the switch is open? Electrons turn around? They ...
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3answers
194 views
How can an electron have 0 electric potential after exiting a resistor but have current?
Unfortunately, I am not able to respond and ask a question on this specific post so I am going to ask a question based on the answers of the user "Transistor" in this post because I am still confused.
...
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3answers
773 views
How do electrons carry thermal energy in Peltier coolers?
I've read that when electrons enter from metal to semiconductor type N, they gain thermal energy and make that side cooler and the reverse happens when they leave semiconductor to the conductor.
Why ...
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2answers
74 views
current speed/flow [closed]
Note
my questions are in form of explaining. its because I've scattered information (or assumptions) and it want to link them. that's probably why you can see me explaining to much?
Question part:
...
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2answers
432 views
A question about electrons, charges and current
Let's talk about DC, a very simple circuit: a light bulb and a battery.
Some authors say that electrons move from negative to positive and current from positive from negative.
I always thought ...
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0answers
290 views
How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other? [duplicate]
An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following:
While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
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2answers
101 views
How do electrons flow?
I have been told that the movement of electrons is like a chain on a bicycle, however on videos for batteries i see that there is a charge seperation and when a wire is connected, these electrons flow ...
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2answers
114 views
Will electrons be taken from a metal plate if a positive charge is applied to it?
If I have a single metal plate, a battery, and one wire. If I connect the wire to the positive on the battery to the metal plate, does that remove electrons from the metal plate?
I am attempting to ...
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3answers
183 views
Why the earth attracts charge and where does the charge go when it goes into ground?
Self-explanatory question but to add what I know, by this I will also know if I am right or wrong.
I read somewhere that Earth is positively charged, but is not the state (whether positive/negative) ...
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2answers
65 views
Effect of electron discrete nature on current density
Coulomb’s law states that the current that flows through a wire is proportional to the applied voltage. For sure there are many physical effects (linear and non-linear) that participates in the ...
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1answer
202 views
Relation between Amps and Thickness of wires
I have some questions that have been bugging me for the past few days, and I am here in hope of some help.
My Understanding of how battery works: "The battery (say 9V DC) does not store charge, it ...
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3answers
763 views
Why does current have to return to its source in a circuit?
As far as I know there should be a current when a high potential point is connected to a low potential point, but apparently that is not true. I understand that a circuit must be closed in order for ...
5
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3answers
198 views
How does current turn to heat/light? [duplicate]
When resistors are serially connected, the current is the same through the whole circuit. To my knowledge, the electric current is electrons traveling.
Also, the power of the generator equals the ...
3
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3answers
3k views
So which direction do electrons really flow?
As I understand it, electrons (which are negatively charged) flow towards positive.
As a convention, we say that current flows from positive to negative. Is this to say that what you connect the ...
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2answers
205 views
Why do electrons move as if on conveyor belt in a circuit?
For example sometimes people will ask whether it matters what side of a component you place a resistor on. Surprisingly, it doesn't matter because electrons behave as if they're all connected together ...
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1answer
113 views
Electrons and Holes in a semiconductor
In an exercise I have an un-doped silicon I find that p=1.80e+11 ,n=6.60e+10 , should the numbers be more close to each other? (for example in GaAs I find 1.10e+14 and 1.60e+14)?? (also p number of ...
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2answers
178 views
Why is conventional current still taught in school when it is unreal, given that real current flow is electron flow? [duplicate]
Conventional current as a concept is easily understood until the professor says what actually takes place is electron flow. Electron flow moves in the opposite direction as conventional current.
Why ...
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1answer
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Why don't electrons in Parralel battery circuits repel?
Here is a short Anecdote, which will give a good explanation into my question. I was in a Science class, and we were doing a circuit with a very small Filament Light Bulb, and some AAA Batteries. I ...
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2answers
165 views
Conductor interaction with single battery terminal
What really is happening inside a wire and inside battery when I connect one end of wire to the one terminal of battery but not the other (open circuit )?
Questions:
If I connect to the '+' ...
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0answers
94 views
Theory : High voltage but low current
I read that :
A generator products electrons that it sends into wire
The electron motion is due to the repulsive behavior between electrons
So to increase the voltage (speed of electrons?), ...
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2answers
1k views
Number of electron with a current of 1A
i'm reading a book that it says :
If a current of 1A flows through a copper wire, the number of electrons flowing by a cross section of the wire in 1s is equal to :
1A=(1C/1s)(electron/-1.602*...
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2answers
157 views
Where do electrons go after reaching GND in this Arduino Mega design?
When examining the EAGLE file for the Arduino Mega that I downloaded from their official website, I noticed that the ground (GND) is not connected to anything other than the C4 component, which means ...
0
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1answer
139 views
Why does high voltage imply a high “pushing force” on electrons?
Another word for potential difference, is apparently, "voltage drop", although I've heard potential difference be interchangeable with just voltage, as well, a bit confusingly. However, if I ...
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1answer
279 views
conventional current flow and ground plane
I'm a student.
I cant understand why we design ground planes to have a easy (low resistance) path for return current.....
If the real flow of electrons is from battery (-) to battery (+) we should ...
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6answers
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Why do electrons flow from a lower potential energy to a higher potential energy?
So I understand that the term "voltage" refers to the potential energy difference between two points. So, in a 5v battery, there is a 5v difference between the positive and negative ends. When these ...
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1answer
136 views
How to spot different electronic devices? [closed]
Recently my university has changed traditional counter meters into intelligent ones where they cut the power for illegal devices. At first as the rules say, the illegal ones are those with power usage ...
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1answer
3k views
Wiring an On-Off-On-Off pushbutton
I am new to electricity & electronics, and I'm interested in using this "On-Off-On-Off" pushbutton in a project. I want to just make sure that I understand how its intended to be wired:
In that ...
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2answers
61 views
What is the energy in “electron-volts” of an electron that has risen though a potential of 3V?
I came across this question when reading about semiconductors, and found out I didn't really get the concept of electron volt with respect to voltage and electric field applied to an electron.
So the ...
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1answer
343 views
Why is the positive side said to have a higher voltage than the negative side? [closed]
My question is, are textbooks just saying the positive side of a battery has a higher voltage because mathematically + is higher than - even when, in reality, there is nothing to come out of the ...
0
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2answers
87 views
Is there any different on the same amount of amps with different voltages?
Have two different loads on two circuits, the first circuit is running at 3.3V, second is 5V. Those two loads draw exactly 100mA on each. The question is, does those two circuits have the same amount ...
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3answers
301 views
Electromagnetic waves [closed]
I have a problem to understand how electromagnetic waves works. Why do transistors create EM waves when they're switching? And difference between antenna and transformer with secondary coil. When I ...
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2answers
91 views
Why would electrons cross a cross section when there is no potential difference?
There is a cross section , it's said that electrons move from left to right and vice versa, and the total sum of the electrons crossing this section from left to right is equal to the ones crossing ...
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1answer
94 views
Confused about current flow
I am starting to learn about electronics and I am still confused about current flow. Initially the book would try to be clear about the distinction between conventional and actual flow but then ...
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0answers
366 views
Semiconductor physics, effective mass calculations, band edge. vs. DOS vs cyclotron resonance
I am trying to understand effective mass for electron carriers in the conduction band as found in experiments. I am using the equations in a simulator. The simulator models power mosfets from -85C to ...
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2answers
1k views
electron flow discharging/charging battery [closed]
I understand that the electron flow is from the anode to cathode when discharging a battery but I don't understand why it is reversed for when charging a battery?
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4answers
1k views
Why can you not create an Infinite Battery? [closed]
As far I know the power electricity is flow of electrons from anode to cathode of the battery. So basically the electrons flow through the circuit and return to cathode. Why can't we reuse these ...
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1answer
74 views
NOOB Question: Is there away to keep electrons constantly flowing?
What i mean by this is we run things on lets say a battery, but eventually it runs out. Is there away we can have electrons stay trapped in a constant flow so the electrons keep getting recycled?
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0answers
39 views
Another way to increase Tungsten filament resistance? [duplicate]
I understand that the thing that allow a lightbulb to glow white high is the fast amount of resistance the electrons face with all the many spiral the filament has. But I need a thicker more resistant ...
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6answers
3k views
How to function a TV electron gun for experiments [closed]
right to the point, I'm study physics and I want to do some experiments like q/m, oscilloscope, etc and I needed an electron gun. I had an old crt TV and I took out it's electron gun and vacuum tube ...
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4answers
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Free Electron in Current
An electric current is a flow of free electrons. Are these free electrons totally free from the orbits of metal atom or they moving by jumping from one orbit to another orbit of the atoms?
If they ...
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3answers
752 views
Are diodes backwards?
So I've been learning about diodes (since I don't have an electrical background).
Technically, current flows from the negative side to the positive side (electron current flow).
However, a diode ...
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2answers
663 views
Run out of electrons
If electricity is a flow of electrons in a wire then eventually all electrons will leave the beginning of the wire and reach the end of the wire. Is that possible? Why if not? What will happen then if ...
